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Judging by the expression on the man's face, whatever it is that he hears, it isn't good.

Judging by the expression on the man's face, whatever it is that he hears, it isn't good.

"A portable TV concept created in 1967." by ahtisham-ahmed in RetroFuturism

"A portable TV concept created in 1967." by ahtisham-ahmed in RetroFuturism

Las formidables defensas de la Línea Maginot llevaron a Francia a la inacción y a la derrota - World War II Social Place

Las formidables defensas de la Línea Maginot llevaron a Francia a la inacción y a la derrota - World War II Social Place

During World War I, aerial warfare became increasingly important. Zeppelin airships conducted bombing raids on the south coast of England, and winged aircraft were employed as bombers by both sides. If their approach was detected, fighter aircraft could head off the enemy or shoot them down.  Giant WWI "war tubas" were designed to hear aircraft engines from a distance, Some were small and portable, for the use of one person. The operator listened using stethoscope-style headphones.

Giant WWI "war tubas" were pretty much exactly what they sound like

During World War I, aerial warfare became increasingly important. Zeppelin airships conducted bombing raids on the south coast of England, and winged aircraft were employed as bombers by both sides. If their approach was detected, fighter aircraft could head off the enemy or shoot them down. Giant WWI "war tubas" were designed to hear aircraft engines from a distance, Some were small and portable, for the use of one person. The operator listened using stethoscope-style headphones.

WW II Blurt Listening Device Mk I  A primitive blurt listening device that eventually proved ineffective in that by the time the marauding blurts were finally heard, the accompanying filth was in the trenches. Made way for the Mk II which had superior blurt listening superiority

WW II Blurt Listening Device Mk I A primitive blurt listening device that eventually proved ineffective in that by the time the marauding blurts were finally heard, the accompanying filth was in the trenches. Made way for the Mk II which had superior blurt listening superiority

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